Floor register with adjustable louvers



L.-C. COTTS FLOOR REGISTER WITH ADJUSTABLE LOUVERS Sept. 1, 1959 2Sheets-Sheet 1 Filed Sept. 4, 1956 W M fill T M w INVENTOR.

| c. coTTs 2,901,961

FLOOR REGISTER WITH ADJUSTABLE LOUVERS 2 Sheets-Sheet 2 Sept. 1, 1959Filed Sept. 4, 1956 INVENTOR.

Carri United States Patent FLOOR REGISTER WITH ADJUSTABLE LOUVERS L'ouisC. Cotts, Michigan City, Ind.

Application September 4, 1956, Serial No. 607,878

11 Claims. (Cl. 98103) This invention relates to improvements in floorregisters used in conjunction with warm air heating systems, airconditioning systems, or combination systems for both heating andcooling, and each of the forced flow type.

The usual practice in the manufacture of floor registers for use insystems for heating or air conditioning which are of the forced airtype, is to provide the same with air directing or diverting louvers.These louvers are usually fixed to the housing of the register and arelocated at different angles for the purpose of permitting substantiallyvertical discharge of air through the central portion of the registerwhile deflecting laterally the air discharged from the opposite ends ofthe register, so as to increase the lateral throw of air discharged fromthe register. These fixed louvers are usually ineffective for projectingair laterally from the ends of the register to any substantial distancebecause they are generally narrow in width and of small surface area sothat they do not materially deflect air flow therepast. The narrownessof the blades requires close spacing thereof and use of a large numberthereof, with the result that a high resistance to flow of air throughthe register is encountered.

Another characteristic of conventional registers is that, if a damper isused therein, it must be separate from the air-deflecting vanes orlouvers. Such separate damper serves merely to control the rate of flowof air which impinges upon the turning vanes. If the rate of flow of airthrough the register is small, little directional control is provided bythe vanes or louvers, and the pattern of the air discharged from theregister is narrow rather than flared or laterally elongated, anddiffers very little from the pattern of air discharged from a registerof a convection or gravity type warm air heating system. The use ofdampers in addition to turning vanes or louvers has the furtherobjection of rendering the construction expensive because of the largenumber of parts employed therein and the high cost of fabrication of theparts and their assembly.

It is the primary object of this invention to provide a floor registerwhich is simple in construction, which is comparatively inexpensive,which is easy to adjust, which reduces to a minimum the number of partsrequired in fabrication thereof, and which overcomes the disadvantagesmentioned above with respect to prior floor registers.

A further object is to provide a register having a plurality of louversrotatably mounted therein and individually adjustable between a closedposition substantially preventing flow through the register and an openposition in which the flow of air is substantially unretarded but isdirectionally controlled as selected or set manually.

A further object is to provide a register with a plural-ity of rotatablelouvers and means for rotating said louvers individually and throughdifferent angles for presenting difierent direction control factors atdifferent louvers.

A further object is to provide a register having rotatable louversarranged in groups and means for rotating the louvers arranged in eachgroup progressively and successively to a final flow directing positionin which each louver in each group is differently oriented with respectto the direction of flow of air therepast so as to possess a directioncontrol function dilferent than each of the other louvers.

A further object of the invention is to provide a register withrotatable louvers and means for successively rotating the same so as tomaintain the velocity of air flow and the directional controllingproperties of the device when low output settings of the register aremade by adjusting the control at a partially open position only.

A further object is to provide a register having rotatable louvers withmeans for rotating said louvers from a closed position progressively andsuccessively to different angular settings and with separate means forrotating said louvers to similarly oriented open positions.

Other objects will be apparent from the following specification.

In the drawings:

Fig. 1 is a fragmentary perspective view of one embodiment of theinvention and illustrating the louvers thereof in closed position;

Fig. 2 is a longitudinal vertical sectional view taken on line 22 ofFig. 3, and illustrating one group of louvers in open position and asecond group of louvers in closed position;

Fig. 3 is an enlarged vertical transverse sectional view taken on line33 of Fig. 2;

Fig. 4- is a fragmentary vertical longitudinal sectional View similar toFig. 2 and illustrating a modified construction of the device;

Fig. 5 is an enlarged longitudinal vertical sectional detail viewsimilar to Fig. 2 and illustrating a modified construction oflouver-actuating means with the louvers thereof in closed position;

Fig. 6 is a longitudinal sectional view taken on line 6-6 of Fig. 5;

Fig. 7 is a view similar to Fig. 5 but illustrating the parts in adifferent setting or adjustment thereof;

Fig. 8 is a longitudinal sectional view taken on line 8-8 of Fig. 7;

Fig. 9 is a longitudinal vertical sectional view similar to Fig. 5 andillustrating a third operating position of the louvers;

Fig. 10 is a longitudinal sectional view taken on line 10-10 of Fig. 9;and

Fig. 11 is a fragmentary vertical transverse sectional view of aregister employing the construction illustrated in Fig. 5 and taken online 11-11 of Fig. 5.

Referring to the drawings, and particularly to Figs. 1 to 3, the numeral10 designates side walls, and the numeral 12 designates the end walls ofthe frame of a heat register, preferably of substantially rectangularelongated outline. O utturned flanges 14 are provided at the uppermargins of the walls 10 and 12 and have connected thereto an aperturedmargin defining top plate or face plate 16 whose aperture preferablysubstantially coincides with the passage defined by the walls 10 and 12.The plate 16 bears upon and is preferably secured to flooring 18 of abuilding around an opening 20 therein through which the registerdepends. The register is connected at its lower margin with a boot 22connected with a conduit (not shown) of an air circulating anddistributing system, such as a forced air heating system or a forced aircirculating cooling system. A plurality of longitudinal spaced bars ortread members 24 are carried by the register end walls 12 with theirupper edges substantially flush with the top surface of the top plate16.

A plurality of louvers 26 are arranged in the register to e tfindtransversely thereof. Each louver is preferably, though not necessarily,of curved or arcuate crosssectional'form. Each louver'preferably haslegs 28 extending perpendicularly therefrom at the ends thereof and isapertured to receive a pivot pin 30 passing through an aperture in'the'adjacent side wall 10. 'The pivot pins 3% (Sf-each louver are axiallyaligned and are preferably located substantially'centrally'of the louverso that each louver can rock about an axis "transverse of the registerand lengthwise of itself. The-louvers are preferably cut out at a partof each end 32 thereof. Each longitudinal edge of eachlouver 26 ispreferably curved oppositely to'the curvature of the louver to define alongitudinal reinforcing lip 34. At one end thereof, and preferablyat'the cut-away portion 29,- each louver is provided with an'arm 36-bentangularly therefrom in a direction opposite'to'the legs 28. Thus the arm36 is here shown as=extending or projecting from the convex face of thelouver and the legs 23 are shown as projecting from the-concave surfaceof the louver. The arms 36 preferably are'laterally offset from the legs28.

In the construction illustrated in Figs. 1 and 2, the endmost louvers 27are transversely curved for a portion only of the width thereof, and theremaining outer portion 29 thereof is substantially flat. The louvers 27also are preferably wider than the louvers 26, as best seen-in Fig. 2.

The louvers 26 and 27 are'pivoted at substantially equispaced pointsalong the longitudinal walls of the register and in such-positions thatthe marginal flanges 34 of adjacent louvers overlap, as illustrated atthe right in Fig. 2, when the louvers are in closed positionsubstantially'horizontally oriented relative to the register.

The louvers are preferably arranged in two sets or groups, asillustrated in Fig. 2, with the louvers ineach set being adapted toswing in a direction opposite to the direction in which the louvers ofthe other set swing between closed position, as shown at the right inFig. 2, and open position, as shown at the left in Fig. 2. In the formof the device illustrated in Figs. 1 and 2, the louvers of each groupare interconnected and associated bymeans'of a common actuator. Each ofthese actuators is of the character adapted to progressively andsuccessivelymove or rotate the louvers of the associated group duringits movement from a fully closed position tora fullyopen position. Inother words, the arrangement is such that initial movement of theactuating means froma closed position toward an open position will openor rockv the innermost louver ofthe set only. Then after a predeterminedamount of movement of the innermost louver has occurred, the actuatorwill commence movement of the next outer louver together with the innerlouver. Then, after further movement of the actuator, the'rnextouterlouver is-movedalong with the two inner louvers. This progressivepick-up of the louvers requires lostmotion means associated with eachlouver and having different degrees of play. The parts are preferably soarranged thatiby thetime the actuating means reaches fully :openposition all of the louvers will have been moved to'some degree, but theoutermost louver will have been moved only a slight extent compared tothe innermost louver, and the intervening louvers will havebeen'progressively moved between the minimum opening. of the outerlouver and the maximum opening of the innermost louver of the group.

The lostmotion actuating means for accomplishing the progressive openingof the louvers of each group may take various forms. I have illustratedin Figs. 1 and 2) .one form which this means may take, which constitutesanelongated bar 40 extending alongside one side wall o-f'the register tobe shiftable longitudinally thereof, as by means .of'a handle portion 42projecting upwardly between a side wall and one of the tread members 24.The-innermost'louver of the'groupwith which the actuator 40 isassociated has its arm 36 pivoted to the actuator at 44 on an "axisfixed with refr t0 th actuator. The successive louvers 26 and 27 havepivot pins '46, 48 and 50 projecting from the respective arms 36 thereofand passing freely into longitudinally spaced apertures 47, 49 and 51,respectively, formed in the bar it The apertures 47, 49 and 51 are ofprogressively different lengths and preferably are of a width or heightgreater than the diameter of the pins 46, 48 and 50 passingtherethrough. The leading edges of the openings 47, 49 and.51,.that..is,,theleft-hand edges of the openings in the right-hand bar, as seen inFig. '2, are spaced apart uniformly a distance substantially equal tothe spacing of the pivot axis 30 of the louvers.

The arrangement of the louvers and the-actuating means therefor withrespect to each other and to the register frame is such that initialmovement of the bar 40 from a closed position, as illustrated at theright in Fig. 2, toward an open position will entail movement or rockingof the central or innermost louver 26 only until such time as'thetrailing edge of the aperture 47, which is spaced from the pin $6 'inthe closed position of the louver, strikes that pin, whereupon thelouver associated with the pin 46 is rocked along with the innermostlouver. The two innermost louvers are then rocked together until thetrailingedge of the aperture 49 engages the pin 48, whereupon the louverassociated-with the pin 48 is actuated by further movement of the bar40. Ultimately, the trailing edge of the aperture 51 strikes the pin 50,so that'final movement of the actuating member toward its innermostposition, as illustrated at the left in Fig. 2, entails pivoting of allof the louvers simultaneously.

The parts are preferably so arranged that the inner most louver will berocked through an angle of approxi mately degrees to a fully openposition by the full travel of the member 40, and each of the otherlouvers will be rocked to progressively lesser degrees. For example, thesecond louver may be rocked through an angle of 67 /2 degrees, the thirdlouver may be rocked through an angle of 45 degrees, and the fourthlouver may be rocked through an angle of 22 /2 degrees. It will beunderstood, however, that the angular displacements aforementioned areillustrative and are not intended to be limiting, and that any desiredrocking of individual louvers may be provided by simply controlling theamount of lost motion of that louver with the actuating means. It willbe apparent, as illustrated in Fig. 2 at the left, that the variouslouvers deflect air forced there-through to-different extents anddegrees in their final position. Thus the central louver has very littleair-deflecting action. The next outer louver, being somewhat inclined,has a slight deflecting property. The next louver producesrnoredeflection, and so on, with the result that the outermost louversdeflect the air impinging thereagainst to substantial extent. Thedeflection of the air may result solely from the angular position of thelouver or partly from such angular position and partly fromthetransverse curvature of the louvers. Thus an assured lateral throw orspread of the air discharged through the register is assured when theregister is infully open position. When the register is in onlypartially open position, the louvers serve as dampers to restrict thefiow of air through the register. It is important to observe, however,that this restriction of the flow of air occurs without sacrifice ofvelocity of the air which is discharged, so that there is no dissipationof the direction controlling characteristics of the device in caseswhere the actuator is .set at a position to open only some'of thelouvers and.to position the others in their closed and flow-retardingpositions. The double function played by the louvers, namely, thefunction of dampers when closed, and the function of deflectors whenopen, eliminates the need for separate or individual dampers and therebyassures: that the number of parts required in the device is heldat. aminimum, so. that the cost of fabrication and assembly of theconstruction is held low.

In cases where the end walls 12 of the register are Substantiallyvertical, as illustrated in Fig. 2, it is necessary to employ anarrangement wherein the outermost louvers 27 are wider than theremaining louvers 26. It is possible, however, to construct the devicein such a manner that each of the louvers 26 employed in the device isof the same size and configuration, and such a construction isillustrated in Fig. 4. The end walls 52 of the register frame flaresupwardly and outwardly and preferably is curved. The outermost louver issimilar to the other louvers and abuts the end wall intermediate itsheight in closed position. If desired, a shoulder 54 may be provided toaccommodate such abutment and provide space for the free end of bar 40.The curvature of end wall part 54 is preferably of the same order as thecurvature and angular displacement of the outermost louver when fullyopen, as illustrated in dotted lines in Fig. 4, so as to cooperate withthe outermost louver in defining a deflecting passage at the end of theregister which is of substantially uniform cross-section. The side wallsof the register of the Fig. 4 construction are preferably flat andsubstantially vertical, as illustrated in Figs. 1 and 3, and theconstruction and arrangement of the parts will otherwise be similar tothat illustrated in Figs. 1 to 3 in that the actuating means will havedifferent amounts of lost motion with respect to the differentindividual louvers so that progressive amounts of actuation or rotationof the louvers occur incident to the operation of the actuator 40*.

In instances where the register is to function as the outlet for air inan air cooling system or in a combination heating and cooling system, itmay be desirable to adjust the device in open position with the varyingdirectional properties of the louvers omitted so that minimum resistanceto discharge or flow of air from the register may be provided. Such anarrangement may be provided by incorporation of an additional lostmotion actuating mechanism operable independently of the actuatingmechanism which functions to move the louvers to different angles asdescribed above. Thus there may be associated with the mechanismillustrated and described in Figs. 1 to 3 an additional mechanismcapable of functioning after the primary actuating mechanism 40 hasmoved to fully open position. The purpose of such additional actuatingmechanism is to move to fully open position each of the louvers whichwere only partially opened by the operation of the primary actuatingmechamsm.

A construction of this character is illustrated in Figs. 5 to 11 andentails the provision of a second bar or rod 60 located alongside thebar 40 and having a handle or grip portion '62 projecting therefromwithin convenient reach of a user by inserting a finger between one sidewall of the register and a tread member 24. The bar 60 will preferablybe of shorter length than the bar 40, as best seen in Figs. 6, 8 and 10,so that in the closed position of the louvers the inner end thereof willbe spaced from the pivot pin 44 connecting the innermost louver 26 tothe bar 40. The bar 60 has slots 67, 69, 71 therein to receive andaccommodate each of the pivot pins 47, 49 and 51, respectively, carriedby the arms 36 of the remaining louvers 26 and 27. The slots 67, 69 and71, in the form here illustrated, are longitudinally elongated toaccommodate free play or movement of the pins 46, 48 and 50 thereinincident to operation of the actuator 4t) to shift the louvers fromclosed to open position.- The arrangement is such that the trailingedges of the slots 67, 69 and 71, that is, the right-hand ends or edgesthereof as illustrated in Fig. 6, are substantially equally spaced. Thelongest slot is the slot 67 accommodating the pin 46 which travels inthe shortest slot 47 of the actuator 40. The slot 69 is of intermediatelength, and the slot 71 is of shortest length and receives the pin 50which travels in the slot 51 of longest length in the member 40.

I The slots 67, 69 and 71 are of such lengths as to ac- 6 commodatesubstantially full movement of the actuator 40 to shift the various pins44, 46, 48 and 50 associated with the louvers without altering theposition of the bar 60. This arrangement is illustrated in Figs. 7 and 8wherein the bar 46 has moved to its fully open position but the bar 60remains in the same position it occupied in the closed position of thelouvers, as illustrated in Fig. 5. It will be observed, however, thateach of the pins 46, 43 and Si will have moved to the leading end of therespective receiving slots 67, 69 and 71 when the member 4% has reachedits fully open position.

After the parts reach the position illustrated in Figs. 7 and 8 with thelouvers open to different degrees or extents, it is possible to shiftthe louvers to fully open position by moving the bar 60 to the positionillustrated in Fig. 9. As this movement occurs, the trailing orrighthand end of the shortest slot 71 in the member 60, as viewed inFigs. 9 and 10, first contacts the pin 50 associated with the outermostlouver and shifts the same until it has been moved to the same tiltedangle as the next adjacent louver. Then the trailing end of the slot 69will engage the pin 48 to pick up the same and thereafter move thelouvers associated with said pins 48 and 5t!) simultaneously until theyboth reach the angle of opening of the next adjacent louver, whereuponpin 56 is engaged by the trailing end of the slot 67 and all louversexcept the innermost louver are then moved toward open position untilthey reach fully open position, as illustrated in Fig. 9. It will beobserved that in the position shown in Figs. 9 and 10 the pins 46, 48and 50 have been advanced to the leading or left-hand edges of the slots47, 49 and 51 of the member 40.

When it is desired to close the louvers to the positions illustrated atthe right in Fig. 2, the actuator 40 is moved toward the right from theposition shown in Fig. 9. Since the pins 46, 48 and 54 are then engagingthe trailing or right-hand ends of the slots 67, 69 and 71, as viewed inFig. 10, the movement of the member 40 will carry along with it themember 69 until the parts are restored to the position illustrated inFig. 5.

While it may be desirable in most instances to provide the device withactuating means, such as the actuators 49 and 6f? which serve to actuategroups or all of the louvers of a register incident to one actuationthereof, it is not essential that such actuating means be provided.Instead, each of the arms 36 associated with the respective louvers maybe made of such length that they can be grasped and manipulatedindividually and manually by users reaching through the grating at theupper part of the register defined by the tread members 24. In suchinstances it is desirable to provide sufficient friction at the pivots23, 36 which mount the louvers, to insure that the louvers will maintainany position in which they are set. In such instances the louvers canserve the same dual function of air deflection or direction flowcontrol, on the one hand, and as dampers on the other hand, which hasbeen described above. Such individual adjustment has advantage incertain instances by permitting selected deflection of air at all partsof the register.

While the preferred embodiments of the invention have been illustratedand described, it will be understood that changes in the constructionmay be made within the scope of the appended claims without departingfrom the spirit of the invention.

I claim:

1. A floor register adapted for connection with a forced air circulatingsystem, comprising a frame having side and end walls and defining an airoutlet, a plurality of louvers pivoted in said frame on parallel axesand cooperating to substantially close said outlet in one positionthereof, and means in said frame adjacent one end of said louvers forrocking a group of said louvers, said means having lost motionconnection with said selected louvers of said group, and a secondindependently operable means in said frame adjacent an end of saidlouvers 7 and having lost motion connection with the louvers, of thesame group, to rock; said selected louvers more than taste roc ed by dir t me n Z A fioor registeradapted for connection with a forced aircirculating system, comprising a frame having side and. end walls anddefining an air outlet, a plurality of louvers pivoted in said frame onparallel axes and cooperating to substantially close said outlet in oneposition therecf, and means for rocking a group of said louvers, saidmeans having lost motion connection with selected louvers of said group,and a second independently operable means for rocking the louvers of thesame group, said sccond louver-rocking means having lost motionconnections with said louversand being operable to rock said selected;louvers, beyond the position to which they are rocked by said firstmeans.

3. A floor register adapted for connection with a forced air circulatingsystem, comprising a frame having side and, end walls and defining anair outlet, a plurality of louvers pivoted in said frame on parallelaxes and cooperating to substantially close said outlet in one positionthereof, and an elongated member shiftable endwise in said frame andtransversely of said louver pivot axes, means connecting said member tothe louvers of a group spaced from the pivot axes of the louvers, atleast one of said connection means accommodating lost motion of saidmember relative to a louver, and a second elongated member substantiallyparallel to and shiftable independently of said first elongated member,said second elongated member having lost motion connection to the louvers having lost motion connection with said first member and beingoperable to rock the louvers having lost motion, connection with saidfirst shiftable member beyond the position to which they are rocked bysaid first member.

4. A floor register adapted for connection with a forced air circulating"system, comprising. a frame having side and end Walls and defining anair outlet, a plurality of louvers pivoted in said frame on parallelaxes and cooperating to substantially close said outlet in one positionthereof, an elongated bar shiftable in said frame transverse of saidpivot axes and having a plurality of longie tudinally spaced openings,means carried by said louversspaced from their pivot axes and extendinginto said openings, some of saidopenings being elongated wherebymovement of said bar partially actuates selected louvers, and a secondindependently shiftable elongated bar sub-.. stantially parallel, tosaidfirst bar and having a plurality of longitudinally spaced openingsreceiving said last named means. and. operable to rock said selectedlouvers beyond the position to which they are rocked by said first bar.

5. A fioor register adapted for connection with a forced air circulatingsystem, comprising a frame having side and. end walls and defining anair outlet, a plurality of louvers-pivoted in said. frame on parallelaxes and cooperating to substantially close said outlet in one positionthereof, and an elongated shiftable bar having a plurality oflongitudinally spaced openings, means carried by said louversspacedfrom, their pivot axes and extending intorsaid openings, some of saidopenings being elongated whereby movement of said bar partially rocksselQied louvers, and a second elongated independently shiftable barsubstantially parallel to said first bar and having a plurality oflongitudinally spaced openings receiving said last named means, at leastsome of the openings in said second bar being elongated and theelongated openings in both bars being of different lengths, theelongated openings in one bar having the ends nearest one end of saidbar substantially equally spaced from each other and the elongatedopenings in the other bar having the ends nearest the opposite end. ofsaid other bar substantially equally spacedfrom each other, the spacingof the equally spacedendsof both bars being substantially equal ta t e ai g of he B axe f h dj c t r s i s cond b rina r e at v o a d, se ected.louv s beyond the. pqs i a to which he ar v ro k bya fir t an Afl r; e tr antedc o w n ctio h forc d:- air circulating. system, comprising aframe having side andend walls and defining an. air outlet, a pluralityof louvers, having legs substantially perpendicular thereto, at the endsthereof, means pivoting said louvers in said frame at the free ends ofsaid. legs on parallel axes, extending lengthwise of and between thesideedges of said louvers, said louvers, cooperating to substantiallyclosesaid outlet in one position thereof, each louver being-cut away ata part of one end thereof, an elongated mem ber shiftableend-wise. insaid frame adjacent one side and transversely of said lo uven pivotaxes, and means, connecting said member to the louvers of a group: atpoints. spaced fromv the pivot axes of said louvers includ-. ing alateral projection on each louver at said cutaway, at least one of, saidconnection means including an elongated slot extending lengthwise insaid member and loosely receiving a pincarried by an end portion of oneof; saidlateral projections to accommodate lost motion of said memberrelative to said louver, whereby each louver having such lost motionconnection, is rotated through; a smaller angle than the remaininglouvers as determined by the length of the associated slot uponactuationof said shiftable member.

7. A floor register as defined in claim 6, whereinsaid' frame; end wallsflare oppositely upwardly andoutwardly, the louvers adjacent said end;walls being adapted to as: lim n: n in p i cn s b ant l c c din wi h theinclination of said end walls to deflect in endwise n pw rd: w airimpinging t s d end ouvers 8, Afioor register as defined in claim 6,whereina, p lu rality of said louvers have slotted lost motion connetion with said, member, said slotsbeing of different lengths wherebysaidglouvers are tilted successively and through, differentangles byactuation of said shiftable member.

9;. A floor register adapted for connection with a forced; air;circulating system, comprising a frame hav-. ingside and end walls anddefining an air outlet, a pluralit-yof louvers-pivoted insaid frame onparallel, axes and cooperating to substantially close said outlet in oneposition. thereof, each louver being cut away at apart of-anendthereof,and means withinsaid frame forrock-. ing a group of said louvers, said,means having lostmo-, tion connection with selected louvers of saidgroup to partially actuate said selected louvers, anda second meansWithin said frame connected to andindependently rockv able for further,rocking the aforesaid selected louvers ofthesame group, said secondmeans having lost motion; connections with at least some of the louversconnected thereto, said first and second louver-rocking means both beingpositioned between said frame and the cut away portions of, said louverswhen said, louvers are in open position.

10. A floor register adapted for connection, with a forced aircirculating system, comprising a frame having side and end walls anddefining an air outlet, a plurality of louvers pivoted in said frame onparallel axes and cooperating to substantially close said outlet in oneposition thereof, and an elongated bar shiftable transversely of saidaxes and having a plurality of longitu dinally spaced openings, meanscarried by said louvers spaced'from their pivot axes and extendingintosaid openings, some of. said openings being elongated whereby, movementof said bar partially actuates selected louvers, and a secondindependently shiftableelongated bar substantially parallel to saidfirst bar and having aplurality of longitudinally spaced openingsreceiving said last namedmeans, at, least some of the openings in saidsecond bar being elongated and the elongated openings in both bars beingof different lengths and being arranged if rent rd r hs e a co d a Qk$;Q

lected louvers beyond the position to which they are rocked by saidfirst bar.

11. A floor register adapted for connection with a forced aircirculating system, comprising a frame having side and end walls anddefining an air outlet, a plurality of louvers pivoted in said frame onparallel axes and cooperating to substantially close said outlet in oneposition thereof, and an elongated shiftable bar having a plurality oflongitudinally spaced openings, means carried by said louvers spacedfrom their pivot axes and extending into said openings, some of saidopenings being elongated, whereby movement of said bar partially rocksselected louvers, and a second elongated independently shiftable barsubstantially parallel to said first bar and having a plurality oflongitudinally spaced openings receiving said last named means, at leastsome of the openings in said second bar being elongated and theelongated openings in both bars being of different lengths, theelongated openings in one bar having the ends thereof nearest one end ofsaid bar substantially equally spaced 10 from each other and theelongated openings in the other bar having the ends thereof nearest theopposite end of said other bar substantially equally spaced from eachother, said second bar being operative to rock said selected louversbeyond the position to which they are rocked by said first bar.

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